import ical from "ical-generator";
import { NextResponse } from "next/server";
import { prisma } from "../../../../lib/prisma";

export async function GET(
  _request: Request,
  context: { params: { token: string } }
) {
  const view = await prisma.userView.findUnique({
    where: { token: context.params.token },
    include: { items: { include: { event: true } }, user: true }
  });

  if (!view) {
    return NextResponse.json({ error: "Not found" }, { status: 404 });
  }

  const calendar = ical({
    name: `Vereinskalender - ${view.name}`,
    timezone: "Europe/Berlin"
  });

  view.items
    .map((item) => item.event)
    .filter((event) => event.status === "APPROVED")
    .forEach((event) => {
      calendar.createEvent({
        id: event.id,
        summary: event.title,
        description: event.description || undefined,
        location: event.location || undefined,
        start: event.startAt,
        end: event.endAt
      });
    });

  return new NextResponse(calendar.toString(), {
    headers: {
      "Content-Type": "text/calendar; charset=utf-8"
    }
  });
}